#1D5C78
Closest named color: Petrol (#005F6A). oklch(44.8% 0.077 231.6), rgb(29, 92, 120).
Aa
White text reads best on this color (7.35:1).
About this color
#1D5C78 is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.077 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.031 away. White text reads best on it, at 7.35:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.85:1 |
| White text | 7.35:1 |
Values
| HEX | #1D5C78 |
| RGB | rgb(29, 92, 120) |
| HSL | hsl(198, 61%, 29%) |
| OKLCH | oklch(44.8% 0.077 231.6) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #1D5C78 | 7.35:1 | AAA | Lc -90.2 | Preferred for body text |
| Black text on #1D5C78 | 2.85:1 | Fails | Lc 18.7 | Dividers and decoration only |
| #1D5C78 text on white | 7.35:1 | AAA | Lc 85.3 | Fine for body text |
| #1D5C78 text on black | 2.85:1 | Fails | Lc -16.7 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2ECF1
oklch(93.7% 0.013 228.9)
-
Step 200
200
#C9DDE7
oklch(88.6% 0.025 229.2)
-
Step 300
300
#A4C6D9
oklch(80.8% 0.045 232.5)
-
Step 400
400
#71A9C6
oklch(70.7% 0.072 231.7)
-
Step 500
500
#4893B7
oklch(63% 0.092 231.6)
-
Step 600
600
#237DA3
oklch(55.6% 0.1 231.2)
-
Step 700
700
#13698C
oklch(49% 0.094 231.8)
-
Step 800
800 (this color)
#1D5C78
oklch(44.8% 0.077 231.6)
-
Step 900
900
#1A475C
oklch(37.7% 0.06 231.8)
-
Step 950
950
#112A36
oklch(27.1% 0.038 231.3)
#1D5C78 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #4E5B79 | 0.052 |
| Deuteranopia (no green cones) | #425278 | 0.045 |
| Tritanopia (no blue cones) | #006465 | 0.048 |
| Achromatopsia (no color) | #565656 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D5C78
#1D5C78
oklch(44.8% 0.077 231.6)
- #76482A
#76482A
oklch(44.8% 0.077 52.7)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #1D5C78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.031
- Light Navy Blue #2E5A88 ΔE 0.033
- YInMn Blue #415A77 ΔE 0.034
- Deep Sea Blue #015482 ΔE 0.036
- Light Navy #155084 ΔE 0.047
- Denim #3B638C ΔE 0.048
- Dusk Blue #26538D ΔE 0.050
- Peacock Blue #016795 ΔE 0.051
Use #1D5C78 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.